(Updated at 1:30 p.m.) SANTA MARIA, Brazil — Brazilian police officials said Monday they’ve made three detentions and are seeking a fourth person in connection with a blaze that ripped through a nightclub in southern Brazil over the weekend, killing more than 230 people.

Inspector Ranolfo Vieira Junior said at a news conference that the detentions are for investigative purposes and those detained can be held up to five days. He declined to identify those detained or the fourth person sought, but the Brazilian newspaper Zero Hora quotes lawyer Jader Marques saying his client Elissandro Spohr, a co-owner of the club, had been held.

The paper also says police detained two band members who were on stage when the blaze broke out and were thought to have used pyrotechnics in their act.

A military brigade official said Monday the death toll now stands at 231 people in the early Sunday blaze in the Kiss nightclub in Santa Maria, a university town of about 260,000 people in southern Brazil. Many of the victims were under 20 years old, including some minors. Most victims died from smoke inhalation rather than burns.

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Police have said they think the pyrotechnics ignited sound insulation on the ceiling, while witnesses have reported a fire extinguisher didn’t work and that there was only one working exit. Many of the dead were also found in the club’s two bathrooms, where they fled apparently because the blinding smoke caused them to believe the doors were exits.

“It was terrible inside — it was like one of those films of the Holocaust, bodies piled atop one another,” said police inspector Sandro Meinerz. “We had to use trucks to remove them. It took about six hours to take the bodies away.”

Survivors and another police inspector, Marcelo Arigony, said security guards briefly tried to block people from exiting the club. Brazilian bars routinely make patrons pay their entire tab at the end of the night before they are allowed to leave.

“It was chaotic and it doesn’t seem to have been done in bad faith because several security guards also died,” Arigony told The Associated Press.

Firefighters responding to the blaze initially had trouble getting inside the Kiss nightclub because “there was a barrier of bodies blocking the entrance,” Guido Pedroso Melo, commander of the city’s fire department, told the O Globo newspaper.

Authorities said band members who were on the stage when the fire broke out later talked with police and confirmed they used pyrotechnics during their show.

Guitarist Rodrigo Martins told Radio Gaucha that the band, Gurizada Fandangueira, started playing at 2:15 a.m. “and we had played around five songs when I looked up and noticed the roof was burning.”

“It might have happened because of the Sputnik, the machine we use to create a luminous effect with sparks. It’s harmless, we never had any trouble with it,” he said. “When the fire started, a guard passed us a fire extinguisher, the singer tried to use it but it wasn’t working.”

He confirmed that accordion player Danilo Jacques, 28, died, while the five other members made it out safely.

Survivor Michele Pereira told the Folha de S. Paulo newspaper that she was near the stage when members of the band lit some sort of flare that started the conflagration.

“The band that was onstage began to use flares and, suddenly, they stopped the show and pointed them upward,” she said. “At that point, the ceiling caught fire. It was really weak, but in a matter of seconds it spread.”

Police inspector Meinerz, who coordinated the investigation at the nightclub, said one band member died after escaping because he returned inside the burning building to save his accordion. The other band members escaped alive because they were the first to notice the fire.

Television images from Santa Maria showed black smoke billowing out of the Kiss nightclub as shirtless young men who attended the university party joined firefighters using axes and sledgehammers to pound at the hot-pink exterior walls, trying to reach those trapped inside.

Teenagers sprinted from the scene after the fire began, desperately seeking help. Others carried injured and burned friends away in their arms. About half of those killed were men, about half women.

Bodies of the dead and injured were strewn in the street and panicked screams filled the air as medics tried to help. There was little to be done; officials said most of those who died suffocated within minutes.

“There was so much smoke and fire, it was complete panic, and it took a long time for people to get out, there were so many dead,” survivor Luana Santos Silva told the Globo TV network.

The fire spread so fast inside the packed club that firefighters and ambulances could do little to stop it, Silva said.

A community gym soon became a horror scene, with body after body lined up on the floor, partially covered with black plastic as family members identified kin.

Outside the gym, police held up personal objects — a black purse, a blue high-heeled shoe — as people seeking information on loved ones crowded around hoping not to recognize anything being shown them.

The party was organized by students from several academic departments at the Federal University of Santa Maria. Such organized university parties are common throughout Brazil.

Police Maj. Cleberson Braida Bastianello said by telephone that the toll had risen to 233 with the death of a hospitalized victim.

Brazil President Dilma Rousseff arrived Sunday to visit the injured after cutting short her trip to a Latin American-European summit in Chile.

“It is a tragedy for all of us,” said Rousseff, who began her political career in the state where the tragedy took place.

Dr. Paulo Afonso Beltrame, a professor at the medical school of the Federal University of Santa Maria. said he was told the club had been filled far beyond its capacity. He had gone to the city’s Caridade Hospital to help victims.

“Large amounts of toxic smoke quickly filled the room, and I would say that at least 90 percent of the victims died of asphyxiation,” Beltrame told the AP.

“The toxic smoke made people lose their sense of direction so they were unable to find their way to the exit. At least 50 bodies were found inside a bathroom.”

In the hospital, the doctor “saw desperate friends and relatives walking and running down the corridors looking for information,” he said, calling it “one of the saddest scenes I have ever witnessed.”

Rodrigo Moura, identified by the newspaper Diario de Santa Maria as a security guard at the club, said it was at its maximum capacity of between 1,000 and 2,000 people, and partygoers were pushing and shoving to escape.

Santa Maria Mayor Cezar Schirmer declared a 30-day mourning period, and Tarso Genro, the governor of the southern state of Rio Grande do Sul, said officials were investigating the cause of the disaster.

The blaze was the deadliest in Brazil since at least 1961, when a fire that swept through a circus killed 503 people in Niteroi, Rio de Janeiro.

Sunday’s fire also appeared to be the worst at a nightclub since December 2000, when a welding accident reportedly set off a fire at a club in Luoyang, China, killing 309 people.

In 2004, at least 194 people died in a fire at an overcrowded nightclub in Buenos Aires, Argentina. Seven members of the band playing at the club were sentenced to prison for starting the flames.

A blaze at the Lame Horse nightclub in Perm, Russia, killed 152 people in December 2009 after an indoor fireworks display ignited a plastic ceiling decorated with branches.

Similar circumstances led to a 2003 nightclub fire that killed 100 people in the United States. Pyrotechnics used as a stage prop by the 1980s rock band Great White set ablaze cheap soundproofing foam on the walls and ceiling of a Rhode Island music venue.

The band performing in Santa Maria, Gurizada Fandangueira, plays a driving mixture of local Brazilian country music styles. Guitarist Martin told Radio Gaucha the musicians are already seeing hostile messages.

“People on the social networks are saying we have to pay for what happened,” he said. “I’m afraid there could be retaliation”.

SANTA MARIA, Brazil (AP) — Brazilian police say they’ve made three arrests and are seeking a fourth person in connection with a nightclub fire that killed more than 230 people.

Inspector Ranolfo Vieira Junior said at a Monday press conference that the arrests are for investigative purposes. He says the detentions have five-day limits.

He declined to identify those arrested or the fourth person sought.

More than 230 people died early Sunday during the fire at a university party in southern Brazil. Police have said they think a band’s pyrotechnics show ignited sound insulation on the ceiling, causing the blaze.

The Zero Hora newspaper quotes lawyer Jader Marques as saying his client Elissandro Spohr, a co-owner of the club, was arrested. The paper also says two band members were arrested.

Funerals began Monday in the city of Santa Maria, Brazil, where the blaze took place.